I used to think that plastic water bottles could be infinitely recycled, that every time…
The post How Many Times Can That Be Recycled? appeared first on Earth911.
Although you might think mice are cute and furry, you probably don’t want them living…
The post 5 No-Kill Strategies for Getting Rid of Mice appeared first on Earth911.
A new study has found that the planet’s oceans are experiencing a “triple threat” of oxygen loss, extreme heat and acidification.
The researchers discovered that, as global heating has worsened, increasing stress has been placed on marine species, with as much as 20 percent of the world’s oceans affected by these threats.
“The global ocean is becoming warmer, more acidic, and losing oxygen due to climate change. On top of this trend, sudden increases in temperature, or drops in pH or oxygen adversely affect marine organisms when they cannot quickly adapt to these extreme conditions,” the study said.
The first-of-its-kind study found that many vertical water column-compound extreme events occur in high latitudes and the tropics, last 10 to 30 days and reduce habitable space by as much as 75 percent.
Global heating, caused primarily by humans burning fossil fuels for energy, has led to compound events in the top 984 feet of the ocean being six times more intense and lasting three times longer than they did in the early 1960s, according to the study, as The Guardian reported.
“The impacts of this have already been seen and felt,” said lead author of the study Joel Wong, a researcher with ETH Zürich, as reported by The Guardian. “Intense extreme events like these are likely to happen again in the future and will disrupt marine ecosystems and fisheries around the world.”
The study, “Column-Compound Extremes in the Global Ocean,” was published in the journal AGU Advances.
As ocean temperatures rise, it not only affects marine life, but the intensity of tropical storms.
“The heat has been literally off the charts, it’s been astonishing to see. We can’t fully explain the temperatures we are seeing in the Atlantic, for example, which is part of the reason why hurricane season is such a concern this year,” said Andrea Dutton, a University of Wisconsin–Madison climate scientist and geologist who was not part of the study, as The Guardian reported. “It’s quite frightening.”
As the world’s oceans soak up excess carbon dioxide and heat from the burning of fossil fuels, the carbon leads to increased ocean acidity while depleting oxygen levels. This pushes fish and other species out of their normal habitats and dissolves the shells of marine organisms.
“This means that marine life is being squeezed out of places it is able to survive,” Dutton said, as reported by The Guardian. “People have to recognize that oceans have been buffering us from the amount of heat we have been feeling on land as humans, but that this hasn’t been without consequence.”
The post World’s Oceans Face ‘Triple Threat’ of Oxygen Loss, Extreme Heat and Acidification, Study Finds appeared first on EcoWatch.
At an economic summit in Ireland last month, New York Governor Kathy Hochul bragged about her state’s decades-long quest to implement so-called congestion pricing in New York City. Within mere months, the extensive toll system was poised to take effect, charging cars and trucks a once-per-day fee between $15 and $36 to enter lower Manhattan — a move that, in addition to the quality-of-life benefits touted by Hochul, promised to both drastically reduce carbon emissions in one of the country’s most congested regions and also provide badly needed funding for its most extensive mass transit system.
“It took a long time because people feared backlash from drivers set in their ways,” she said in her speech. “We must get over that.”
Ultimately, however, Hochul herself couldn’t seem to get over this fear. On Wednesday, the governor announced an “indefinite” halt to the soon-to-debut program. In doing so, she jeopardized not only a road-ready policy to improve quality of life in New York City but also the “nation-leading climate plan” that is one of the governor’s signature initiatives.
In reality, New York’s ambitious climate goals — cutting greenhouse gas emissions 40 percent by 2030 and 85 percent by 2050 — predate the current governor. The state passed its landmark climate law back in 2019, but ever since then its success has been far from certain. This is in large part because the effort depends on a lot of factors that are outside of the state government’s control: the completion of major wind farms in the waters off of Long Island, the building of an electricity transmission line to bring carbon-free hydropower into the state, and the retrofitting of thousands of old and inefficient buildings in New York City, among others.
One thing the government could control, however, was congestion pricing, a plan that had undergone years of consultation, modeling, and study that demonstrated with confidence that it would dramatically slash car traffic in New York City, easing gridlock and reducing air pollution from vehicle tailpipes. Modeled on successful programs in London and other European cities, the toll policy traveled a long road to approval since then-mayor Michael Bloomberg started to push for it in earnest around 2007. It was finally set to become a reality this month, following years of stringent environmental review and political squabbling. Then, on Wednesday, Hochul ordered the Metropolitan Transit Authority to “indefinitely pause” the program, saying it would have placed an “undue strain” on drivers and added “another burden to middle class New Yorkers.”
The abrupt decision, reportedly an attempt to court voters in contested congressional districts in suburbs outside the city, has all but doomed what had been a landmark climate policy more than a decade in the making. (The governor’s office did not immediately respond to Grist’s request for comment on Wednesday afternoon.) It has also left many transit and climate advocates rudderless, and clouded the state’s path to meeting its already tenuous climate goals.
“We cannot take on climate change without addressing transportation,” said Sara Lind, the co-executive director of Open Plans, an urbanist advocacy group based in New York City. “Canceling it is a huge mistake in terms of our approach to climate change. We need our Democratic governor to be a leader on climate change, but she’s just caving.”
Indeed, transportation is the largest source of greenhouse gas emissions in New York state and the second-largest emissions source in New York City, just behind the city’s buildings. It’s also the largest source of air pollution from harmful tailpipe chemicals like nitrogen oxide and carbon monoxide, which cause asthma and a bevy of other lung and heart diseases.
The MTA’s analysis of the program found that congestion pricing would reduce traffic into lower Manhattan by around 17 percent, cutting the city’s overall carbon emissions by around 1 percent as drivers opted to take public transportation instead of driving, burning less gasoline in the process. These effects would have been most significant in downtown Manhattan, where the policy would have reduced greenhouse gas pollution by more than 11 percent.
The policy was also projected to promote a virtuous cycle in the city: The MTA estimated it would collect around $1 billion per year in tolls, and it planned to use that money to anchor a $15 billion bond issuance for capital work on New York’s aging but heavily-used public transit system. Upgrades and expansions in the subway and bus system would likely have incentivized more residents to take mass transit rather than driving.
Similar congestion pricing systems have achieved air quality benefits in places such as London, Singapore, and Stockholm, which saw carbon emissions decline by around 10 percent when it rolled out a tolling program. A recent analysis of 16 such systems found that they “provide local governments with a relatively cost-effective tool to implement consistent reductions in greenhouse gas emissions.”
Despite the data, the congestion pricing plan had many opponents, from New Jersey’s Democratic governor Phil Murphy to Republican state representatives on Long Island. Many of these opponents cast the $15-per-day congestion fee as a regressive tax on low-income drivers in the outer boroughs and suburbs. The MTA’s analysis found that these concerns were overblown. According to the agency, there are only 5,200 residents in New York City who commute to Manhattan by car and live more than a half-mile away from some form of public transit. The agency also promised to create a toll waiver for low-income drivers, though that category was estimated to include only 18,000 drivers in the entire New York metropolitan area, which is home to more than 20 million people.
The plan also drew criticism from some community advocates in outer boroughs such as the Bronx and Staten Island, who argued that discouraging traffic into Manhattan would increase pollution burdens in their neighborhoods. The MTA found that these increases would be minuscule, but it also pledged to mitigate them by taking steps like electrifying diesel trucks in pollution hotspots like the Bronx’s Hunts Point Food Market.
But this year, as the policy inched closer to becoming a reality, most politicians and interest groups in New York came around to supporting it. Even the Real Estate Board of New York, or REBNY, a powerful lobby that has supported Hochul, expressed disappointment with her decision to scrap the toll program.
“Congestion pricing will provide environmental and transportation benefits that will make New York City more competitive on the national and international stage,” said REBNY president James Whelan in a statement. “Any delay in its implementation should be of a limited duration.”
In the pre-recorded video that announced her decision, Hochul said that “there never is only one path forward.” Indeed, says Lind, there are other measures that New York could take to reduce transportation emissions: The city could restrict freight traffic deliveries to certain periods of the day, as other cities such as Barcelona and Rome have done, or it could limit driving in residential neighborhoods. But the state’s best weapon to discourage driving is the MTA itself, and it’s hard to imagine the beleaguered agency upgrading its subway and bus systems without the billion-dollar boost that would have come from the congestion tolls.
This story was originally published by Grist with the headline Caving on climate: Kathy Hochul axes congestion pricing in New York on Jun 5, 2024.
The United States National Oceanic and Atmospheric Administration (NOAA) has announced the designation of the 1,722-square-mile Lake Ontario National Marine Sanctuary in eastern Lake Ontario, New York.
It is the country’s 16th national marine sanctuary and will celebrate the area’s Indigenous and maritime history while providing new opportunities for education, research, recreation and tourism related to maritime heritage in coastal communities, a press release from NOAA said.
“President Biden is leading the most ambitious conservation agenda in history through the America the Beautiful Initiative, and today’s marine sanctuary designation is another key milestone in that effort,” said Brenda Mallory, chair of the White House council on environmental quality, in the press release. “For generations to come, families will be able to learn about our nation’s maritime history and the rich cultural heritage of Lake Ontario.”
America the Beautiful has a goal of conserving, protecting or restoring a minimum of 30 percent of lands and waters in the U.S. by 2030. President Joe Biden has set aside more than 41 million acres for conservation.
“The designation of this sanctuary is a milestone for NOAA, New York and the nation. Establishing a national marine sanctuary in the cold fresh waters of eastern Lake Ontario opens the door to world-class research and education initiatives, and provides opportunities to support and enhance tourism and the local economy within one of the most historically significant regions in the Great Lakes,” said Rick Spinrad, NOAA administrator, in the press release.
The waters and coastline of Eastern Lake Ontario hold a diverse heritage and history, including trade routes and transportation, beginning with early Indigenous settlements.
The marine sanctuary features a collection of 41 found shipwrecks and a submerged aircraft that is one of the world’s best preserved.
Map of known and potential wreck locations (approximate) within Lake Ontario National Marine Sanctuary. NOAA
“The shipwrecks, such as St. Peter, a three-masted schooner that was loaded with coal when it was lost in a storm in 1898, embody more than two centuries of the nation’s maritime history,” the NOAA press release said.
Another three aircraft, 19 shipwrecks and other archaeological sites may still be located in the area, according to historical records, a press release from the National Marine Sanctuary Foundation said.
NOAA will further locate, monitor and research the discoveries, as well as other cultural resources of maritime history. NOAA will also partner with Indigenous governments and other local partners to promote education and outreach.
“From sacred places and cultural practices to lighthouses and historic shipwrecks, this region’s maritime cultural legacy provides meaning and a sense of place to countless generations,” said Nicole R. LeBoeuf, director of the National Ocean Service, in the NOAA press release. “NOAA looks forward to working with a wide range of partners to learn, share and celebrate the remarkable history of the eastern Lake Ontario region.”
Nomination for the sanctuary was made by a group of organizations that included the Onondaga Nation, museums, conservation, recreation, education and tourism groups, historical societies and local government units.
Portions of the homelands of the Cayuga, Seneca, Onondaga and Oneida Nations lie within the boundaries of the sanctuary.
“NOAA acknowledges and respects that eastern Lake Ontario is of cultural, spiritual and historical significance to the Nations of the Haudenosaunee Confederacy, who have been stewards of their homelands for thousands of years and continue to care for these lands and waters,” said John Armor, director of the Office of National Marine Sanctuaries, in the NOAA press release. “We are dedicated to building equitable partnerships with Indigenous Peoples in the stewardship of these waters.”
The sanctuary will be co-managed by New York State and NOAA. It is the third marine sanctuary in the Great Lakes and the first in New York.
“The designation of Lake Ontario National Marine Sanctuary ensures that this bustling, vibrant, and historic part of the state of New York will be recognized as one of the most iconic U.S. waters, alongside vast expanses of the Pacific, the vibrant deep of the Gulf of Mexico, the reefs of the Florida Keys,” said Joel Johnson, president and CEO of the National Marine Sanctuary Foundation, in a press release from the foundation. “This announcement creates new opportunities for education on American and Tribal history, outdoor recreation and exploration for New Yorkers and for all Americans.”
On September 6 at 11 a.m., there will be an event to celebrate the new sanctuary at William S. Cahill Pier in Oswego, New York. For more information, visit the sanctuary’s website.
The post NOAA Designates 1,722-Square Mile National Marine Sanctuary in New York appeared first on EcoWatch.
Scientists have determined that the rate of global warming increased in 2023, the same year that the Northern Hemisphere experienced its hottest summer on record. The vast majority, 92%, of extreme heat in 2023 could be attributed to humans, scientists said.
A team of 57 scientists completed research on the high temperatures the world experienced in 2023 and used methods approved by the United Nations to investigate the warming, The Associated Press reported. They found that the world reached a warming rate of 0.26 degrees Celsius (0.47 degrees Fahrenheit) per decade in 2023, a record high rate. In 2022, the warming rate per decade had been 0.25 degrees Celsius (0.45 degrees Fahrenheit). They published their findings in the journal Earth System Science Data.
According to the study, the average greenhouse gas emissions per decade have been on a constant increase since the 1970s, especially because of an increase in carbon dioxide emissions from fossil fuels. There have also been increases in methane and nitrous oxide, the report noted.
However, the report authors wrote that while the rate of warming reached a record in 2023, it was still in line with the warming rates of the past few decades and met warming predictions established from a 2001 through 2020 time frame to 2021 through 2040.
“If you look at this world accelerating or going through a big tipping point, things aren’t doing that,” Piers Forster, lead author of the study and a professor of climate physics at Leeds University, told The Associated Press. “Things are increasing in temperature and getting worse in sort of exactly the way we predicted.”
The study found that the increase in global surface temperatures could be linked primarily to a wide range of human activities. While fossil fuel and industry were the primary factors, according to scientists, they also noted land use, contrails and other factors played a part in the increased warming rate.
The warming was also impacted by natural factors, including volcanic activity and the El Niño climate pattern that took place for much of 2023. Last year, the United Nations’ World Meteorological Organization (WMO) had warned that El Niño could push global temperatures past the 1.5 degree Celsius threshold outlined in the Paris Agreement. An international team of scientists have predicted that El Niño could contribute to global heating this year, too.
According to the new study, the average global temperature for 2023 reached 1.43 degrees Celsius over the pre-industrial average, and over the past decade, average warming is about 1.19 degrees Celsius above pre-industrial global temperatures.
With this, the scientists wrote that the 1.5 degree Celsius warming limit could be reached or exceeded within the next decade, but there is hope that emissions and the rate of warming could decline with societal changes.
“Acceleration if it were to happen would be even worse, like hitting a global tipping point, it would be probably the worst scenario,” Sonia Seneviratne, co-author of the study and the head of land-climate dynamics at ETH Zurich, told The Associated Press. “But what is happening is already extremely bad and it is having major impacts already now. We are in the middle of a crisis.”
The post Rate of Global Warming Reached a Record High in 2023, Scientists Say appeared first on EcoWatch.
“I think science is the perfect way to solve this issue. Because a lot of innovation and invention happens in science, and technology is always changing. And so I think, if I really wanted to make a big impact, this would be the way to go.”
High schooler and science fair winner Victoria Ou
Last month, around 2,000 high school students from all over the world traveled to Los Angeles for the annual Regeneron International Science and Engineering Fair, or ISEF. Reading the list of winning projects is … well, intimidating, even for a 30-year-old who technically has a degree in science. The top prize (of $75,000 — this is not the science fair from your high school gym) went to Grace Sun for her project “Novel Chemical Doping Strategy to Enhance N-Type Organic Electrochemical Transistors.” Another top award went to a project titled “Solving Second-Order Cone Programs in Matrix Multiplication Time.”
This year’s entrants included several climate-related projects as well: an AI approach to wildfire detection; a palm tree-inspired prototype for disaster-resilient building; a new energy-smart approach to optimizing indoor temperatures.
Youth climate activists get a lot of attention. We see them taking to the streets, demanding action, and holding policymakers accountable, and we believe their passion could change the world. But looking at these ISEF projects, it struck me that we often overlook this very different form of youth leadership.
These are not kids being pushed into crazy science projects by strict parents or overzealous teachers. They want to change the world, too — through research and innovation. And talking to them just confirms that.
“I want to help make sure that future generations can still have the same planet that we live on — that they don’t have to constantly worry about their health just because of what we have done in the past,” said Victoria Ou, another of this year’s top winners.
Victoria and Justin Huang, two 17-year-olds from The Woodlands College Park High School in Texas, designed a system that filters microplastic particles out of water using ultrasound waves. Their project received the Gordon E. Moore Award for Positive Outcomes for Future Generations, which comes with a scholarship prize of $50,000.
Victoria and Justin pose with their award at ISEF. Society for Science / Lisa Fryklund
They’ve competed in science fairs before, starting in middle school. Justin notes that it’s a part of the culture in their school system — they both attend the Academy of Science and Technology within College Park High School. But this was their first time teaming up, and their first time going to ISEF. They’ve both been interested in environmental science for some time (Justin cites the Pixar movie WALL-E as an early influence) and constructed their device themselves, doing the research in their own homes.
In their experiments, the device they built was able to successfully trap up to 94 percent of the microplastic particles present in the system, letting clean water flow out the other side. They’re keen to continue working on the invention, refining the design and ultimately looking toward scaling it up. But in the meantime, they’re hopeful that their success can serve as an inspiration to other young scientists, or anyone wondering how they can make a difference on an issue as thorny as the microplastics crisis.
Talking to them was like talking to any passionate youngsters (if those youngsters used a lot of terminology you had to google on the side and also invented a device with the potential to change one of the biggest problems facing our planet). I spoke with them a couple weeks after their ISEF win about their project, their experiences at the science fair, and what they’ve learned along the way. Their responses have been edited and condensed for clarity.
Q. Do you want to start by telling me a little bit about yourselves, and your interest in science?
Victoria: OK, I can go first. I’m Victoria Ou, I’m a current junior — well, ongoing to senior, in high school. We’ve actually been in school together since elementary. So we had the same sixth-grade science teacher, and she was kind of our big inspiration for getting into science. She really showed a lot of passion for it. And she was the one who had us do a science project that was really similar to a science fair. For my project that year, I actually did plastic pollution, which is how this kind of all started. I first read about the Great Pacific Garbage Patch and microplastics that we’re getting into our water and our food. And I was like, This is definitely a huge problem.
Justin: Ms. Caldwell was really the first one who raised the issue about the environment, and how we have one Earth and what we’re doing to it is really not good. So moving forward into our future, we wanted to be able to help with this issue. That’s how we got involved with this environmental aspect of science. She was the big inspiration for both of us.
Q. I’m sure that must mean a lot to her. So tell me more about your research, and how you got started with this project.
Victoria: So, we know microplastics are a huge issue, right? They get into all of our food and water and produce a lot of harmful health issues. We were looking into some possible ways to filter them out of our water. And there are a lot of current methods that we were looking at, but they all have their own disadvantages. Some of them are too expensive or too slow to work. And some of them also added chemicals that could be harmful to our health, which we definitely don’t want.
We were thinking of a more noninvasive approach. And we came upon two main studies for this — the first showed how ultrasound could be used to get red blood cells within your bloodstream to clump together. And we thought, ”Oh, this is kind of a similar concept to microplastics in water.” So we kept digging a little more into that and found another study that showed how they could focus microplastics within the water. So you would have water flowing and the microplastics would gather into streams in the water. We used these two as a big inspiration for our own project.
Victoria and Justin hold up their invention in front of their booth at ISEF. While it looks a little like two pens taped together, it is not, in fact, two pens taped together. Why would you even think that. Society for Science / Chris Ayers Photography
Q: How exactly does your invention work (for a nonscience person)?
Victoria: So imagine you have your tube, and water’s flowing this way. We have a transducer [Editor’s note: That’s a device that converts energy into something else] attached to one section of the tube that’s producing ultrasound. So as water is going this way, the ultrasound produces a force that pushes microplastics back the opposite way, but the water is still able to get through. So at the end we have water coming out, but the microplastics, they all kind of get stuck in the upper half of the tube, and that’s where they eventually accumulate. And we can clean them out afterwards.
Justin: You can think of it as invisible filtration — because you can’t really see the sound waves. But the microplastics are still getting blocked within the system, within the tube itself.
One of the things that we thought of here was, if we’re looking at physical filters, they’re really easy to get clogged. We wanted to make sure we didn’t have the same problem. In our experimentation, we did tests with high concentrations of microplastics, like, thousands of times higher than what we would see in real life, as well as really high volumes of water. And our system was still able to work really well. In the end, the microplastics are clumped together in the entry part of the tube — and we would have to clean it out eventually, but it doesn’t really run into any of the problems that physical filters do.
Q. What was it like testing your device? How did you build the experiment?
Justin: So first, to create the system — there’s actually equipment out there to generate ultrasound, but it’s really expensive.
Victoria: We found that there are three main components, which are the signal generator [Ed: an electronic device that produces electrical signals, or currents], power amplifier [Ed: does what it sounds like], and piezoelectric transducers [Ed: basically, converting electricity into vibrations].
So the signal generator and power amplifier we were able to borrow from Electronics and Innovation [Ed. an equipment manufacturer in New York]. They were actually really generous because we emailed them, we were like, “Hey, could we maybe rent this for this amount of money?” But once they heard we were high school students trying to do research, they were like, “Actually, we can give you this old model for free.” And we were super blown away, definitely could not have done it without them. Once we had the signal generator and power amplifier, we could produce the electrical impulses needed for our transducers to convert into ultrasound.
Justin: How we collected our data was we had microplastic samples that we created, whether that be shavings of objects around the house that were plastic, or cutting up plastic straws or that kind of stuff. And then we would put it in water and then we would have a syringe pump that we could slowly push the water through. That’s how we tested the system. We collected the water at the end, and then we did some analysis to see how much we filtered.
Q. How do you envision your device being used in the real world?
Victoria: We were thinking of two main applications for our device. One would be in water-treatment plants, since that directly impacts us and the water we use. And we were also, based on previous studies in the field, thinking of using this for laundry machines, to clean up the synthetic textile particles that come out of the laundry machines. Because they actually contribute to around 35 percent of primary microplastics pollution. So being able to clean up the laundry water before it goes back into the environment would help a lot, since we cut them off at the source instead of having to continuously clean them up from the environment.
Q. What do you feel like you learned going through the process of inventing this device and then taking it to ISEF?
Justin: Definitely something that I would’ve liked to hear when I was back in eighth grade doing science fair for the first time, is to always stay curious. Because you never know if something that you’re going to learn now is going to be useful in the future. I remember when I was in fifth grade, I built some LED lights with my grandpa — and that engineering skill really translated over to actually building the system here. So just stay curious and don’t give up.
Victoria: I guess on that note, I could also add to not be afraid of failure. When I went to ISEF, I was actually super intimidated by everyone else. I’d talk to a person, they’re like, “Oh, I’m going to Harvard, I’m going to MIT,” and I was like, “Oh my gosh, how could I ever measure up to these people? They’ve probably been successful their whole lives.” And I think having gone through the whole ISEF process, I just never realized that they put in a lot of hard work, too. Everything you see is only just the surface, right? You don’t see all the late nights, hundreds of hours of hard work that everyone puts in, and you don’t see the parts where they fail, either. Because no one ever wants to talk about that. But I think going through failure at some point is super important, because we failed a lot of times throughout our project, and each time it helped us learn something that could help us achieve the next step of being able to reach our goal. So I think just don’t give up, and learn from your mistakes, but keep going.
Q. On the note of never giving up — does doing this work make you feel more hopeful about our future, and more empowered to act on big issues like pollution and the climate crisis?
Justin: Yeah, definitely. You always see these things on the internet or on TV about how so-and-so invented whatever, to cure some disease or to solve some environmental issue. It’s really surreal being the ones who were able to create this, because we thought it took like, decades and decades of research. And of course it does, and what we have is just kind of a small step in our journey. But being able to see how just two high schoolers, from their own home, without even a lab, could make a difference in the world — I feel like that was truly something that inspired us, that can inspire us to go even further in the future.
Victoria: For me, going to ISEF was already super fun and I think that was fulfilling enough. And for other people, they don’t necessarily have to feel like you have to win an award or do something super famous to make a difference. I volunteer with our township sometimes to clean up trash. And every time I do that, I still feel almost as fulfilled as standing on that stage, you know? So I think just seeing the little things in life also is super fulfilling, and seeing how you can help the people next to you.
— Claire Elise Thompson
In the U.K., environmental artist and activist Rob Arnold invented a filtration device (pictured here) that separates bits of plastic from sand and other natural detritus, using a filtering system that involves water flotation. He and other volunteers use the machine on beach cleanups to collect “nurdles,” tiny plastic pellets that are used to manufacture a range of plastic materials, but often end up as waste themselves.
This story was originally published by Grist with the headline A different kind of youth activist: Meet the high schoolers who invented a microplastics solution on Jun 5, 2024.
They call it “The Blob.” A vast expanse of ocean stretching from Alaska to California periodically warms by up to 4 degrees Celsius (7 degrees Fahrenheit), decimating fish stocks, starving seabirds, creating blooms of toxic algae, preventing salmon returns to rivers, displacing sea lions, and forcing whales into shipping lanes to find food.
The Blob first formed in 2013 and spread across an area of the northeast Pacific the size of Canada. It lasted for three years and keeps coming back — most recently last summer. Until now, scientists have been unable to explain this abrupt ocean heating. Climate change, even combined with natural cycles such as El Niño, is not enough.
But a new analysis suggests an unexpected cause. Xiaotong Zheng, a meteorologist at the Ocean University of China, and international colleagues argue that this extraordinary heating is the result of a dramatic cleanup of Chinese air pollution. The decline in smog particles, which shield the planet from the sun’s rays, has accelerated warming and set off a chain of atmospheric events across the Pacific that have, in effect, cooked the ocean.
Other researchers spoken to by Yale Environment 360 see the finding, made with the help of in-depth climate modeling, as having potentially critical implications for future climate in the Pacific and elsewhere. Emissions of the tiny particles that cause smogs, collectively known as aerosols, are in decline across most of the world — apart from South Asia and Africa. Scientists are concerned that the cleanups will both heat the global atmosphere and lead to more intense regional ocean heat waves.
Yangyang Xu, an atmospheric scientist at Texas A&M University not involved in the study, said it shows that “aerosol reductions will perturb the climate system in ways we have not experienced before. It will give us surprises.”
Indeed, that may already be happening in the Atlantic. Some researchers we spoke to argue that the exceptional heat wave that spread across the North Atlantic from spring last year until April this year, sending fish fleeing for cooler Arctic waters, may have owed its intensity to international efforts to reduce aerosol emissions from ships crossing the ocean.
The idea that cleaning up air pollution can worsen atmospheric warming sounds counterintuitive. But small particles suspended in the atmosphere, collectively known as aerosols, are very different from greenhouse gases. Instead of warming the planet by trapping solar radiation, they shade it by scattering incoming sunlight and sometimes creating clouds.
They don’t stick around in the air for more than a few days. But climate modelers calculate that while they are there, they fend off as much as a third of greenhouse warming.
In recent years, however, this cooling influence has begun to decline in much of the world. Thanks to clean air legislation intended to protect public health, aerosol emissions have been reduced in Europe and North America since the 1980s. And over the past decade, the same has happened in China, where tough government controls on dirty industries, introduced by President Xi Jinping in 2013, have cut overall aerosol emissions by 70 percent, according to Zheng.
Globally, there are now fewer anthropogenic aerosols in the air at any one time than for decades. Susanne Bauer, a climate modeler at the NASA Goddard Institute for Space Studies, says this “turning point of the aerosol era” occurred in the first decade of this century, and seems set to continue, as more countries seek to banish smogs.
As a result, scientists say, the aerosol mask is slipping, causing a boost to global warming in many regions. “We are currently experiencing greenhouse gas-driven global warming enhanced by aerosol removal,” says Ben Booth, a climate modeler at the U.K. Met Office.
The climatic repercussions of this are not unexpected. Predicted declines in aerosol cooling are already factored into projections of future global warming by the Intergovernmental Panel on Climate Change, or IPCC. But Zheng’s new findings on the cause of the warm Pacific blob suggest that we can also expect more and bigger regional climatic surprises.
Why so? The answer lies in the fact that aerosols do not remain aloft for long enough in the air to mix thoroughly in the atmosphere. So national pollution cleanups will create radically new maps of aerosol distribution.
Some areas will heat much more than others, and this differential warming has the potential to destabilize atmospheric circulation patterns, which are largely heat-driven. This is what appears to have been happening in the northeast Pacific, says Zheng.
When he and Hai Wang, also of the Ocean University of China, along with colleagues in the United States and Germany, modeled the likely impacts on circulation systems of the recent cleaning of the air over eastern China, they found that clearing the country’s smogs caused exceptional atmospheric heating downwind over the Pacific.
This altered air pressures and intensified the Aleutian Low, a semi-permanent area of low pressure in the Bering Sea. This in turn reduced wind speeds further east, limiting the ability of the winds to cool the ocean below, providing “a favorable condition for extreme ocean warming.”
Zheng and colleagues warn that the findings are a harbinger of future “disproportionately large” warm-blob events.
Aerosols come in many shapes and sizes, from dust and soot to tiny particles invisible to the eye. They have many natural sources, such as forest fires and dust storms. But since the Industrial Revolution the aerosol load in the atmosphere has been dramatically increased by anthropogenic sources, primarily the burning of fossil fuels such as coal and oil.
These emissions include large volumes of sulfur dioxide, or SO2, a gas that reacts readily with other compounds in the air to create tiny particles that both shade the planet and can act as condensation nuclei that cause atmospheric moisture to coalesce into water droplets that form clouds.
Burning fossil fuels produces both planet-warming carbon dioxide and aerosols that mask much of the warming. Atmospheric temperatures depend on the balance between the two. The last IPCC assessment of climate science, published in 2021, calculated that greenhouse gases were producing a warming effect of around 1.5 degrees C (2.7 degrees F), with 0.4 degrees C (0.7 degrees F) of this masked by aerosols.
“Without the cooling effect of the aerosols, the world would already have reached the 1.5-degree temperature threshold of ‘dangerous’ climate change as set out by the Paris agreement,” says Johannes Quaas, a meteorologist at the University of Leipzig and former IPCC lead author.
But the balance is shifting as ever more countries act to reduce aerosol emissions.
They do so because of a growing awareness of the public health impacts of aerosols, which the World Health Organization calculates cause more than 4 million premature deaths from cancers and respiratory and cardiovascular diseases each year. Air pollution reduced life expectancy in parts of China by up to five years, according to a 2013 study.
Countries are requiring power companies, industries, and vehicle manufacturers to filter particulates and either burn low-sulfur fuel or fit equipment to strip SO2 from stack emissions — thus cleaning up aerosol and SO2 emissions without reducing the energy produced by burning the fuel.
Europe and North America have had clean air laws in place for almost half a century. Since 2013 — following a run of debilitating smogs in many cities — China has followed, at breakneck speed. Its anthropogenic aerosol emissions have fallen by 70 percent in a decade, and SO2 emissions have been reduced even more, from 20.4 million tons in 2013 to 2.4 million tons in 2022.
Chinese researchers have tracked the impact of this on local climate in some detail. Yang Yang, an atmospheric physicist at Nanjing University of Information Science and Technology, calculates that by 2017, it had boosted the existing greenhouse warming trend in eastern China by 0.1 degrees C (0.2 degrees F). As the cleanup extends, including to transportation, he expects this extra heating to increase to between 0.2 and 0.5 degrees C (0.4 and 0.7 degrees F) by 2030, and to more than 0.5 degrees C (0.9 degrees F) by 2060.
Yang predicts it will also trigger changes in local atmospheric circulation that will result in more rainfall over southern China and beyond, in nearby countries such as the Philippines. Zheng’s new research suggests that the effects are already far more long-ranging, stretching across the Pacific to create The Blob on the shores of the U.S.
Where else can we expect disrupting local climate change? Outside of China, researchers are exploring the potential for oceanic climate surprises arising from recent efforts to cut SO2 emissions from shipping.
Dirty, sulfurous diesel has long been the fuel of choice in ships’ boilers. As a result, the world’s shipping fleets until recently emitted more than 10 million tons of SO2 annually, contributing between 10 and 20 percent of the total anthropogenic climate “forcing” from aerosols, says Michael Diamond, who studies aerosols and climate at Florida State University.
Ships are a major cause of aerosol buildup over oceans, where there are usually few other anthropogenic sources. Satellite images show clear tracks of clouds stretching along major shipping routes.
Burning ships’ fuel also emits carbon dioxide, of course. But until recently, ships’ aerosol emissions have probably cooled the planet more than their greenhouse gas emissions have warmed it. That is changing, however. Ships seem set to turn from planetary coolers to planetary warmers.
In 2020, the U.N.’s International Maritime Organization, or IMO, responded to rising pressure to clear the air around ports by reducing the sulfur content allowed in shipping fuel from 3.5 percent to 0.5 percent. Reduced ships’ SO2 emissions have already resulted in fewer clouds over shipping lanes and and higher ocean temperatures.
Diamond says he has a paper currently under peer review whose “takeaway is that something like a third of the North Atlantic marine heat wave [of the past year] might be attributable to the IMO regulations.” Booth, meanwhile, is co-author of a paper preprinted online this month that argues that shipping emissions reductions “may help explain part of the rapid jump in global temperatures over the last 12 months.”
Where are we headed?
If the world works successfully toward lowering greenhouse gas emissions in the coming decades, while also continuing to curb aerosols, then we can still expect continued warming for which aerosol reductions are a growing cause.
Yang recently co-authored a paper that forecasts a midcentury world in which the warming impact of the clearer air will “far outweigh those of greenhouse gases.” There will be “increased humid heat waves with longer duration and stronger amplitudes,” he says.
So what can be done? Can the world have clean air while also keeping warming to bearable levels and avoiding worsening ocean heat waves?
Most scientists spoken to for this article agreed that the best route remains doubling down on reducing greenhouse gas emissions. But Diamond suggests the aerosol dilemma shines a spotlight on the need to give priority to cutting methane emissions.
This virulent greenhouse gas is second to carbon dioxide in importance as a planetary warmer. Right now, notes Diamond, its warming effect is almost identical to the average cooling effect of continued aerosol emissions. And because methane is a relatively short-lived greenhouse gas, persisting in the atmosphere for only around a decade, its elimination can provide a quick fix for some of the impacts of the lost aerosols. Luckily, there is low-hanging fruit to achieve this: The easiest and cheapest actions include preventing the venting of methane from gas and oil wells and pipelines.
To be clear, nobody — but nobody — suggests that we should stop the cleanup of aerosols. The death toll would just be too great.
This story was originally published by Grist with the headline The pollution paradox: How cleaning up smog drives ocean warming on Jun 5, 2024.
Before you head to the mall for that new summer trend, take a second look…
The post DIY Summer Style Ideas appeared first on Earth911.
The future is not written, we can make a better, sustainable future for our children…
The post Best of Earth911 Podcast: Author Chunka Mui on Building a Perfect Future for Our Children appeared first on Earth911.
